Nice usage of the music, I love that there's a lot of stages, and the transitions between them are very colorful and smooth. It constantly felt like there was a new stage everytime, so much content!
For some reason, while playing the web version, halfway through the gameplay my character was always moving slow, and I don't know if it's some bug. The bullets felt a bit weird that they were tiny rectangles, otherwise the visual work is great.
Well done!